Sequentially rotated arrays with reduced sidelobe levels

Hall, Peter; Smith, M.S.

doi:10.1049/el:19921121

Cited by 18 publications

(8 citation statements)

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“…Another interesting approach considers the grouping of the array elements into contiguous subarrays. This methodology has shown to work properly in the case of linear [5]- [7] as well as planar [8]- [10] arrays. The subarraying method is aimed at breaking the periodic errors in the aperture illumination function that generate unwanted grating lobes [11].…”

Section: Introductionmentioning

confidence: 93%

“…Subarrays of random sizes have been considered in [6], while the optimization of both the number of elements within each subarray and the subarray weighting has been dealt with in [7] by means of a hybrid approach. Other techniques based on the sequential rotation of groups of elements of different dimensions [8], on the arrangement of a-periodically spaced subarrays [9], and on properly shaping the subarrays [10] have been proposed to deal with planar structures. Moreover, some general considerations and the results from representative experiments have been reported in [12] to show/evaluate the effects of amplitude and phase quantization when using contiguous subarrays.…”

Section: Introductionmentioning

confidence: 99%

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Design of Subarrayed Linear and Planar Array Antennas With SLL Control Based on an Excitation Matching Approach

Manica

Rocca

Massa

2009

IEEE Trans. Antennas Propagat.

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In this paper, the synthesis of subarrayed antennas with subarrays having different weights and dimensions is considered. The problem is formulated as the definition of the element clustering into spatially contiguous subarrays and the corresponding weights to obtain a pattern with the lowest (i.e., minimum achievable) sidelobe level (SLL). The problem is addressed with an unconstrained approach based on an excitation matching method where the synthesis of subarray weights and sizes is simultaneously carried out. Successively, a hybrid version of such an approach is proposed to directly enforce into the optimization procedure the SLL constraints. A set of representative results concerned with both sum and difference patterns are shown. Furthermore, some comparisons with state-of-the-art hybrid evolutionary-based techniques are reported, as well.

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Design of Subarrayed Linear and Planar Array Antennas With SLL Control Based on an Excitation Matching Approach

Manica

Rocca

Massa

2009

IEEE Trans. Antennas Propagat.

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“…The elements in the subarray can be uniformly weighted or have an amplitude taper that is the same for all subarrays [2]. Other approaches have tried randomizing the number of elements within a given subarray [3], rotating the subarray orientation [4], and nonuniformly spacing the elements within the subarrays [5]. These methods are designed to break the periodicity and redistribute the energy in the GLs throughout the far field pattern.…”

Section: Introductionmentioning

confidence: 98%

“…In [2], [3], the wideband microstrip arrays using the U-slot antenna element are proposed. A wide-bandwidth patch antenna fed by an L-shaped probe is designed in [4]. Early in 1981, Dobust presented an H-shape slot type antenna [5].…”

Section: Introductionmentioning

confidence: 99%

Optimized Weighting of Uniform Subarrays of Unequal Sizes

Haupt

2007

IEEE Trans. Antennas Propagat.

118

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“…The elements in the subarray can be uniformly weighted or have an amplitude taper that is the same for all subarrays [3]. Other approaches have tried randomizing the number of elements within a given subarray [4], rotating the subarray orientation [5], and nonuniformly spacing the elements within the subarrays [6]. Throw this paper two approaches are used to disrupt the periodicity in the array.…”

Section: Introductionmentioning

confidence: 99%

Reduction of Grating Lobes Due to Dividing the Array into Uniform Subarrays Using Genetic Algorithm

Omer

Mitkees²

2011

International Conference on Aerospace Sciences and Aviation Tec

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The total cost of the large arrays can be solved by dividing the array into contiguous subarrays with amplitude and time delay devices at subarray level. This cause appearance of grating lobes when the beam has been steered to small angle away from broadside named grating lobes due to uniform subarrays. These grating lobes caused by the periodicity and the larger spacing between subarrays. If there is a need to steer the main beam at angle that will be small (limited scan), some methods are used to reduce these grating lobes. These methods will be optimized using genetic algorithm implemented using MATLAB. Two approaches used to disrupt the periodicity in the array, so reduction of the grating lobes can be achieved. Three parameters are optimized simultaneously, the amplitude weighting at the subarray ports; the number of elements per subarray and the spacing between elements. The results show that the two approaches reduce the grating lobes upto-9.8 dB for the first approach and-14.6 dB for the second approach, when steered over small-scan angles, up to 15° from broadside, after this range grating lobe will appears again and cannot be reduced.

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Sequentially rotated arrays with reduced sidelobe levels

Cited by 18 publications

References 0 publications

Design of Subarrayed Linear and Planar Array Antennas With SLL Control Based on an Excitation Matching Approach

Design of Subarrayed Linear and Planar Array Antennas With SLL Control Based on an Excitation Matching Approach

Optimized Weighting of Uniform Subarrays of Unequal Sizes

Reduction of Grating Lobes Due to Dividing the Array into Uniform Subarrays Using Genetic Algorithm

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